DUOVIBE

 

 DuoVibe  –  Vibe/Phase/Whatever  

Table  of  Contents  

1   General  Information  ...........................................................................................................................................................  2  

1.1   Circuit  Overview  /  History  .....................................................................................................................................  2  

1.2   Usage  of  Project  Materials  ......................................................................................................................................  2  

2   Project  Information  .............................................................................................................................................................  3  

2.1   PCB  Layout  ....................................................................................................................................................................  3  

2.2   Bill  of  Materials  ............................................................................................................................................................  4  

2.3   Schematic  .......................................................................................................................................................................  5  

3   Build  Notes  ..............................................................................................................................................................................  6  

4   Drill  Plan  /  Dimensions  .....................................................................................................................................................  7  

 

     DUOVIBE

 

1 General  Information  

1.1 Circuit  Overview  /  History  

The  DuoVibe  is  yet  another  expansion  on  Tim  Escobedo’s  “Wobbletron”  circuit  snippet  first  published  in  2005.  I  (culturejam)  have  done  several  circuit  iterations  on  this  cool  little  building  block  snippet  (which  is  also  very  similar  to  the  basic  phase  shift  stage  in  a  Univibe),  and  I  feel  that  this  one  is  a  nice  compromise  between  super-­‐complexity  and  functionality.    

The  DuoVibe  is  a  two-­‐stage  optical  vibe  circuit  than  can  also  cop  subtle  phaser  tones.  The  LFO  is  modified  from  the  Shoot  the  Moon  tremolo  (itself  derivative  of  the  Tremulus  Lune)  and  is  capable  of  triangle  wave  and  near-­‐square  wave  output.  The  pitch  bend  in  Vibe  mode  is  discernible  but  not  capable  of  “seasick”  wobble.  With  the  depth  cranked,  you  can  think  of  it  as  a  sort  of  “tremolo  with  funk  going  on”  kind  of  thing.  

There  is  a  Vibe/Phase  Mode  switch,  the  name  of  which  indicates  its  function  and  purpose.  This  switch  simply  toggles  a  feedback  filtering  cap  value,  but  is  useful  despite  the  simplicity.  See  the  mods  section  below  for  more  detail.  

1.2 Usage  of  Project  Materials  

The  circuit,  name  of  the  project,  and  the  project  PCB  can  all  be  used  for  any  purpose.  That  includes  commercialization  though  the  sale  of  completed  pedals,  populated  PCBs,  kits  of  parts,  reselling  un-­‐populated  PCBs  at  a  profit,  or  anything  else  you  greedy  would-­‐be  bourgeois  pigs  can  dream  up  to  make  a  quick  buck.  Knock  yourself  out.  

   

     DUOVIBE

 

2 Project  Information  

2.1 PCB  Layout  

TOP  OF  BOARD  /  PARTS  

   

BOTTOM  (MIRRORED)  

 

     DUOVIBE

 

2.2 Bill  of  Materials  

Part Value Package Mouser # R1 1M 1/4-watt 291-1M-RC R2 2M2 1/4-watt 291-2.2M-RC R3 10K 1/4-watt 271-10K-RC R4 10K 1/4-watt 271-10K-RC R5 2M2 1/4-watt 291-2.2M-RC R6 10K 1/4-watt 271-10K-RC R7 10K 1/4-watt 271-10K-RC R8 1M 1/4-watt 291-1M-RC R9 1M 1/4-watt 291-1M-RC R10 3K3 1/4-watt 291-3.3K-RC R11 1M 1/4-watt 291-1M-RC R12 220K 1/4-watt 291-220K-RC R13 220K 1/4-watt 291-220K-RC R14 220K 1/4-watt 291-220K-RC R15 220K 1/4-watt 291-220K-RC R16 2K2 1/4-watt 291-2.2K-RC R17 2K2 1/4-watt 291-2.2K-RC R18 1K 1/4-watt 291-1K-RC R19 1K 1/4-watt 291-1K-RC R20 100R 1/4-watt 291-100-RC R21 10K 1/4-watt 271-10K-RC C1 100n Box Cap R82DC3100AA50J C2 22n Box Cap MMK5223K63J01L16.5TR18 C3 100n Box Cap R82DC3100AA50J C4 22n Box Cap MMK5223K63J01L16.5TR18 C5 1u Electrolytic Cap 647-UVZ1H010MDD1TA C6 1u Electrolytic Cap 647-UVZ1H010MDD1TA C7 100u Electrolytic Cap 140-REA101M1EBK0611P C8 10n Box Cap MMK5103J63J01L16.5TR18 C9 10u Electrolytic Cap 140-REA100M1EBK0511P C10 100u Electrolytic Cap 140-REA101M1EBK0611P C11 3n3 Box Cap MMK5332K63J01L16.5TR18 C12 33n Box Cap MMK5333K63J01L16.5TR18 D1 1N4001 DO-41 512-1N4001 D2 LED 5MM / Diffused WP7113GD D3 LED 3MM WP710A10ID5V Q1 2N5089 TO-92 610-2N5089 Q2 2N5089 TO-92 610-2N5089 Q3 2N5089 TO-92 610-2N5089 IC1 RC4558 DIP8 595-RC4558P LDR1 L<1K / D>1M 5MM Smallbear: 2505 / Tayda A-1528 LDR2 L<1K / D>1M 5MM Smallbear: 2505 / Tayda A-1528 Rate B1K 16MM Right Angle PCB Mount Smallbear: 1011 Depth

16MM Right Angle PCB Mount Smallbear: 1011

SW1 (Mode) SPDT Solder Lug Smallbear: 0218B SW2 (Wave) SPDT Solder Lug Smallbear: 0218B

2.2.1 Parts  Substitutions  

•  Q1-­‐Q3  can  be  a  variety  of  part  numbers.  The  most  common  subs:  2N5088,  MPSA18.  Other  NPN  transistors  will  likely  work  just  fine.  The  board  is  laid  out  for  C-­‐B-­‐E  transistors  in  a  TO-­‐92  package.    •  LDR1/2  should  have  an  on  (light)  value  of  less  than  1K,  and  an  off  (dark)  value  of  greater  than  1M.  

     DUOVIBE

 

2.3 Schematic  

 

     DUOVIBE

 

3 Build  Notes  

•  The  PCB  was  designed  with  “top  mounted”  input  and  output  jacks  in  mind.  To  the  end,  there  are  extra  pads  that  run  from  the  top  of  the  PCB  to  the  bottom.  If  you  plan  to  use  top-­‐mounted  jacks,  these  pads  can  save  you  time  and  wire.    

Input  Jack:  The  pad  named  “IJ”  (at  the  top)  connects  to  the  tip  lug  of  the  Input  Jack.  The  pad  named  “IS”  (at  the  bottom)  connects  to  the  “effect  In”  lug  on  the  Switch.  

Output  Jack:  The  pad  named  “OJ”  (at  the  top)  connects  to  the  tip  lug  of  the  Output  Jack.  The  pad  named  “OS”  (at  the  bottom)  connects  to  the  “effect  On”  lug  on  the  Switch.  

For  side-­‐mounted  jacks,  ignore  the  IJ/IS/OJ/OS  pads  and  wire  as  normal.    

•  D3  is  the  bypass  indicator  LED.  It  is  situated  on  the  board  to  be  exactly  in  between  the  two  switches.  You  can  board-­‐mount  the  LED  for  ease  of  build,  or  you  can  put  the  bypass  indicator  LED  elsewhere  on  the  enclosure,  in  which  case  simple  run  the  positive  and  negative  lead  wires  back  to  the  corresponding  pads  on  the  board  for  D1.  

•  D2  is  the  LED  that  drives  the  LDRs  (part  of  the  LFO).  Diffused  LEDs  seem  to  work  best  for  smoother  waveform  sweeps,  but  water-­‐clear  LEDs  can  elicit  more  intense  effects  (at  the  cost  of  a  somewhat  lop-­‐sided  LFO  sweep).    

•  The  positioning  of  LDR1/2  relative  to  D2  affects  the  depth  and  frequency  response  of  the  vibe/phase  tone.  Leave  some  extra  lead  length  on  the  LDRs  and  experiment  with  different  distances  to  the  LED,  especially  if  you  are  use  a  water-­‐clear  LED  for  D2.  

•  C11  and  C12  filter  the  feedback  that  helps  make  the  pitch  bend  (vibe)  or  filter  sweep  (phase).  Adjust  these  values  to  change  the  filter  response  of  either  or  both  mods.  Socket  the  pads  and  go  nuts.  

   

     DUOVIBE

 

4 Drill  Plan  /  Dimensions  

Metric  (MM)  

 

 

Muriken!  (Inches)  

 

 

Hint:  Print  this  page  with  no  scaling  for  physical  reference.  Native  resolution  is  

600dpi.